Adhesive applying device for shoe lasting machines



3,518,968 ADHESIVE APPLYING DEVICE FOR SHOE LASTING MACHINES George C. Barton, Frank R. Smith, and Peter L. Stapleton, Leicester, England, assignors to USM Corporation, Boston, Mass., a corporation of New Jersey Filed Nov. 28, 1967, Ser. No. 686,089 Int. Cl. Bb 3/14 U.S. Cl. 118-302 6 Claims ABSTRACT OF THE DISCLOSURE An adhesive applying device for shoe lasting machines in which adhesive is fed into a chamber in a nozzle and thereafter blown from outlets leading from the chamber by pressurized air directed into the chamber.

BACKGROUND OF THE INVENTION Field of the invention This invention relates to improvements in adhesive applying devices for shoe lasting machines in which adhesive is ejected from a nozzle onto the bottom of an insole and/or the lasting margin of a shoe upper on a form.

Description of the prior art There is shown in US. Pat. No. 3,271,800 a machine in which a shoe upper is molded about the'heel end of a last and the margin of the upper is laid inwardly over and secured to an insole on the bottom of the last. The machine is provided with a device having a nozzle which engages the insole and extrudes a band of adhesive on the insole before the upper is laid thereover. The nozzle is shaped to conform rather closely to the heel end of the insole bottom so the band of adhesive is applied on the insole margin to which the upper is to be secured. Thus, the device must be provided with a number of different sized nozzles to accommodate the variety of shoes which the machine is capable of operating upon.

There was a later developed machine, shown in US. Pat. No. 3,386,114 granted in the name of George C. Barton et al, having an improved adhesive applying device. The nozzle of such improved device acts also as a holddown engaging a central portion of the heel end of the insole bottom. This nozzle has a plurality of outlets through which jets of adhesive are directed against the insole bottom and/or lasting margin of the upper. The jets are formed when adhesive is forced from a metering passageway by an air driven plunger. While this device formed an improvement over that of said patent by accommodating any size shoe without changing the nozzle, it involved rather complex and relatively expensive mechanisms.

SUMMARY OF THE INVENTION Accordingly, it is an object of the invention to provide an improved adhesive applying device which has the advantages of the device shown in said Barton patent and involves a greatly simplified mechanism. To this end the device is provided with a bore in a body member on which the nozzle is mounted. The nozzle is provided with a chamber at the end of the bore and has outlet' openings. A port connected to a source of adhesive leads into the bore and is controlled by a valve in the bore. Another port connected to a source of pressurized air also leads into the bore and may be controlled either by said valve or by a separate adjustably timed valve. The said valve is actuated in one direction to open the adhesive port to admit adhesive into the bore and chamber, and in the opposite direction to close the adhesive port after a de- United States Patent 0 DESCRIPTION OF THE DRAWINGS FIG. 1 is a side elevation of an adhesive applying device embodying the present invention; and

FIG. 2 is a bottom view of a nozzle portion of the device shown in FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The adhesive applying device described herein as the preferred embodiment of the invention is particularly adapted for use with a heel seat lasting machine of the type disclosed in said Barton patent. However, it should be apparent that the device is equally useful in a wide variety of shoe lasting machines without departing from the scope of the invention. As disclosed in said Barton patent such machines may include a holddown against which the heel seat portion of a. shoe comprising an upper and an insole loosely assembled on a form, is clamped by a support. The holddown also may form a nozzle for applying adhesive on the insole bottom and/ or the margin of the upper before lasting means wipe the upper inwardly over the insole bottom. It should be understood, however, that the nozzle described herein could be used apart from a holddown in the same general manner as the nozzle 172 in said US. Pat. No. 3,271,800, without departing from the scope of the invention.

Referring to FIG. 1, there is shown an adhesive applying device embodying the present invention. The device includes a block 3 having a nozzle foot 31 against which a central portion of an insole I on the bottom of a form L is clamped by a support 65. The support is arranged to be moved upwardly to clamp the insole against the foot 31 by a piston and cylinder arrangement (not shown). The block 3 is secured to a carrier member 5 which, in turn, is secured in the machine to a bifurcated end of a lever 67 which generally corresponds to a lever in said Barton patent. The member 5 also has secured thereto a piston and cylinder device 7 having a piston rod 9 operatively connected to a spool valve 11 slideably mounted in a bore 13 in the block 3. The valve has a tail portion 15 extending upwardly through a bore 17 in the member 5 and is provided with a necked end piece 19. This piece receives a bifurcated end of a crossmember 25 adjustably secured to the upper end of the piston rod 9.

The bore 13 terminates at its lower end at a chamber 51 formed by a recess in the nozzle foot 31. The nozzle foot is secured to the lower end of the block 3 by a screw 29, there being a rib 35 on the member engaging a ledge on the block for accurate location. The nozzle is provided with a plurality of outlet ports 33 through which adhesive in the chamber is ejected to impinge on the insole and/ or lasting margin of an upper U on the form L.

Adhesive which may be in molten form is admitted to the bore 13 from an inlet port 37 as controlled by the valve 11. The port is connected to a source of adhesive (not shown) in any convenient manner. If thermoplastic adhesive is to be used, the block 3 is heated by a unit 57 to maintain the adhesive in molten condition. The valve 11 is provided with an annular groove 41 which communicates with an axial bore 45 in the valve through passages 43. The bore 45 extends downwardly to the end of the valve adjacent the chamber 51. In the position of the valve as shown in FIG. 1 a surface 49 on the end piece 19 engages the member 5 and communication between the port 37 and the bore 45 is prevented by a land on the valve above the groove 41.

To admit adhesive to the bore 45 and chamber 51, air or other suitable fluid is admitted to the lower end of the cylinder device 7 through a connection 39 to move the piston rod 9 and valve 11 upwardly until the groove 41 is aligned with the port 37. The valve is maintained in this position for a predetermined period of time so that a measured charge of adhesive is admitted to the bore 45 and chamber 51. Thereafter, the valve is returned to its initial position blocking off further flow of the adhesive by admission of pressurized air to the upper end of the cylinder 7 through a connection 47. It will be noted that in either position of the valve, an annular groove 61 in the valve permits communication to the bore 45 through passages 63 from a port 59 connected to a source of pressurized air (not shown). While the groove 61 could be located so as to provide communication with the pressurized air port 59 only when the adhesive port 37 is closed, it has been found preferable to provide a separate valve means (not shown) to adjustably control admission of air through the port 59 independently of valve 11.

When the separate valve means is operated, pressurized air from port 59 blows the adhesive from the bore 45 and chamber 51 through the'outlet ports 33 to impinge on the insole and/or lasting margin of the upper. Immediately thereafter the lasting means of the machine may be actuated to Wipe the margin of the upper over the insole to be secured thereto by the the adhesive. The particular embodiment of the adhesive applying device is described herein for purposes of illustration only and it should be obvious that the device is useful on a wide variety of shoe lasting machines without departing from the scope of the invention.

Having thus described our invention what we claim as new and desire to secure by Letters Patent of the United States is:

1. In a machine for lasting a portion of a shoe comprising an upper and an insole assembled on a form, and adapted to lay the margin of the upper inwardly over the insole, a nozzle for applying adhesive on the insole and/or the margin of the upper, said nozzle having a chamber for receiving adhesive and passageways leading from the chamber toward the insole and/ or upper margin surfaces to which the adhesive is to be applied, means for feeding a charge of adhesive into the chamber, and means thereafter effective for directing pressurized air against the charge of adhesive in the chamber for blowing the charge of adhesive from the chamber through the passageways.

2. A machine according to claim 1 in which the nozzle is provided with separate inlets for conducting adhesive and pressurized air through a bore to the chamber, means including a valve in the bore controlling said inlets for alternately admitting air or adhesive into said bore, and means for controlling the valve for first causing a charge of adhesive to be admitted through one inlet to the chamber and thereafter for directing pressurized air through another inlet to the chamber to blow the adhesive therefrom.

3. A machine according to claim 2 in which the valve controlling means includes an air operated motor.

4. A machine according to claim 1 in which the nozzle is associated with and forms a part of an abutment against which the insole of the shoe is held.

5. A machine according to claim 4 in which the nozzle is provided with separate inlets for conducting adhesive and pressurized air through a bore to the chamber, and means including a valve in the bore controlling said inlets for alternately admitting air or adhesive into said bore.

6. A machine according to claim 5 in which the valve controlling means includes an air operated motor.

References Cited UNITED STATES PATENTS 3,271,800 9/1966 Allard 1183 XR 2,677,835 5/1954 Kamborian 118323 XR 2,747,539 5/1956 Peffer.

WILLIAM I. PRICE, Primary Examiner R. I. SMITH, Assistant Examiner U.S. Cl. X.R. 

